package com.xiaolun.netty.codec2;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufEncoder;

public class NettyClient {
	public static void main(String[] args) throws Exception {
		//客户端需要一个事件循环组
		EventLoopGroup group = new NioEventLoopGroup();
		try {
			//创建客户端启动对象
			//注意客户端使用的不是 ServerBootstrap 而是 Bootstrap
			Bootstrap bootstrap = new Bootstrap();

			//设置相关参数
			bootstrap.group(group) //设置线程组
					.channel(NioSocketChannel.class) // 设置客户端通道的实现类(反射)
					.handler(new ChannelInitializer<SocketChannel>() {
						@Override
						protected void initChannel(SocketChannel ch) throws Exception {
							ChannelPipeline pipeline = ch.pipeline();
							//在pipeline中加入 ProtoBufEncoder
							pipeline.addLast("encoder", new ProtobufEncoder());
							pipeline.addLast(new NettyClientHandler()); //加入自己的处理器
						}
					});

			System.out.println("客户端 ok..");
			//启动客户端去连接服务器端
			//关于 ChannelFuture 要分析，涉及到netty的异步模型
			ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 6668).sync();
			//给关闭通道进行监听
			channelFuture.channel().closeFuture().sync();
		} finally {
			group.shutdownGracefully();
		}
	}
}
